This bug is very devastating when you sleep and it crashes you can never log in your world again it's just a white screen and on that white screen it only says "leave bed" and "open chat" and when you try to press anything it will just crash and if do nothing it will still crash.
Thank you for your report!
We're actually already tracking this issue at MCPE-79465, so I will resolve and link this ticket as a duplicate.
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